What is a cheaper way to pay in another currency?

Hi Dear Payoneers,

I'll have some traveling this summer and wonder what is a cheaper way to pay in another currency?

Let me give you more details:
I'll be visiting Europe and ordered another card from you in Euro. My primary card in USD.
Just wonder would it be cheaper for me to pay by the USD card or use "Manage Currencies" feature to transfer some money to the EUR card?

Best regards,
Eugene Doronin.